Introduction Car DVR with camera, pickups, microphones, car amplifier, monitor, alarm button, police ming device and other equipment to form the operating environment, the location information through GPS satellite the Car DVR collection of surveillance video and other data via wireless network link (3G/GPRS/CDMA) is sent to the monitoring data exchange center platform (public security command and control center). Can achieve real-time audio and video surveillance video, vehicle alarm linkage, remote video surveillance, GPS location, Internet access and two-way transmission of real-time information and functions. Car DVR is installed in police patrol car PTZ DVR can be configured to control the keyboard, automotive displays, notebook computers, and alarm buzzer device, composed of a strong monitoring system. Police patrol along the image energy intake recorded on the DVR. Real-time monitoring of police officers in the car and camera PTZ cameras necessary emergency alarm or manual recording and capture. The police center can remote real-time observation of police vehicles surrounding situation and call videos can also be timely access to the vehicle alarm information and issued an order scheduling and Alarming. 3 video data via removable hard disk management, video data can be superimposed on the video load time, vehicle number, GPS information, and watermark information strong basis for enforcement.